Newbie, how to prevent early queen attacks like these?

I didn't notice the attack, should I have moved my knight instead of the bishop (which protects the pawn) to protect the queen? Luckily, he resigned to a blunder check on a protected square, but he could still have escaped with a pawn advantage.

You could have just traded Queens on move 3.

No more "early Queen attack".

Was the OP white or black? Which "early" queen attack are we talking about, since both sides had their queens out by move three!

OP was Black.

This guy was playing black, so I'm not sure why he's asking how to stop this "early queen attack" when it just resulted in white blundering the queen

Keep in mind that a lone queen can't (or at least shouldn't) take defended pieces since they'd lose the queen (for example 4.Qxf7 would have been a terrible blunder by your opponent!). So a good way to avoid things like Qxb7 is to be especially watchful of what is undefended when your opponent brings their queen out early. It might be helpful to take some time to familiarize yourself with which pieces and pawns are defended by what at the start of the game, and what tends to change during the first few moves. For example the b and g pawns are only defended by the bishops which usually want to move out into the board, leaving the pawns undefended. the f pawn is only defended by the king at the start, so a lone queen can't take it but if two pieces gang up on it it can be trouble (like scholar's mate, or the fried liver attack). Keeping track of what is defending what while playing is good practice, maybe try going through some of your games (or games from other people) and just looking at which pieces are defended and by what at various points, and how those relationships change as the game progresses (this was not defended but now it is, this used to be defended but these pieces got traded so now it isn't any more, things like that). Hope that helps a bit.

It is more about, being aware of undefended pieces and pawns, not letting opponents win them

Yes. The knight is already happy to go there to defend the queen, unlike the bishop, which just gets in the way of your e pawn and would have preferred to be on a different square. It still defending the pawn if it stays put is also a very nice factor. 

To be fair, black's queen naturally comes out this early due to the capture and white's queen also was the one launching the attack and taking pieces. That the opponent doing the early queen attack resigned that game should do it. 

That said I do prefer it when they set the image in their own view, and both players getting out their queens that fast does give an initial bit of muddiness, even if it is solvable. 

White just randomly blundering their queen had little to do with their previous moves. Before that white was winning. Presumably the OP believes their opponents will not all have their queens arbitrarily commit suicide at this point and instead make a reasonable move to hold on to that lead. If someone finds a line that gave them difficulty, their opponent making an arbitrary blunder that swung the game around doesn't change the prior problem for that player.

These are usually a case of:

1) Look at what your opponent's move threatens
2) Look for MULTIPLE moves that defend that threat
3) Choose the defensive move that helps you develop

In the game 3...Be6 is a bad developing move because it blocks the pawn. 3...Nf6 is better.

Well, black's position is a normal line of the Scandinavian defense.  The correct line here is just 3. Nc3, which kicks the queen to the back row, and then quickly develop and castle, because your king is exposed. 

when oonent brings out queen in beginning of game , make it move if ossible with a developing move like Knight to C3 when queen on d 5  leave your queen back until develoing is almost over , knights before Bishops , then bishops then connect rooks  castle early ,no unnecessary pawn moves 

3.Qf3 Nf6 is probably better than 3.Qf3 Be6. There are a plethora of decent moves to consider  and I'd encourage you to analyze the position yourself to understand why. Also, here's an article on "Opening Theory" basics that should help. https://www.chess.com/article/view/the-principles-of-the-opening

I wonder what the correct move for black is in reaction to Qf3. Maybe just Qd8 back, and claim that white's queen is misplaced and hinders white's development? It is misplaced, but I don't think that you can really prove it quickly.

Opening principles can take you a long way in the beginning. One rule of thumb is to develop knights before bishops.

Nf6 would develop a piece, add a layer of control to d5 and e4, and protect the queen.

Be6 protects the queen BUT it unprotects your pawn on b7 and prevents you from moving your e pawn.

While your knight will almost always be useful on f6, you might later find out that your bishop is more useful elsewhere.  For example, after Nf6 you might later consider Bg4 gaining time attacking the queen (hence another rule of thumb warning against moving your queen to early).  

Just take his queen and he has nothing.

Knight to f6 seems too natural a defense to not play to me. Not that other options don't exist that would also work, but it seems like a clear first choice to consider, whether you pick it or not. 

Everyone recommending different moves, let me chime in with my opinion.

Make sure their queen isn't attacking anything before you kick it away. Eventually, if they keep moving their queen you have an advantage with development and/or you can trap their queen if they move their queen dubiously.

The main line in the Scandinavian defense is 3. Nc3, which develops a piece and kicks the queen.